test(storage): bind FakeServer and TestBench to 127.0.0.1 to avoid localhost IPv6 hangs

Author: Dhriti Chopra

java-storage/google-cloud-storage/src/test/java/com/google/cloud/storage/FakeServer.java

@@ -54,7 +54,7 @@ public void close() throws InterruptedException {
   }
 
   static FakeServer of(StorageGrpc.StorageImplBase service) throws IOException {
-    InetSocketAddress address = new InetSocketAddress("localhost", 0);
+    InetSocketAddress address = new InetSocketAddress("127.0.0.1", 0);
     Server server = NettyServerBuilder.forAddress(address).addService(service).build();
     server.start();
     String endpoint = String.format(Locale.US, "%s:%d", address.getHostString(), server.getPort());

java-storage/google-cloud-storage/src/test/java/com/google/cloud/storage/it/runner/registry/TestBench.java

@@ -442,8 +442,8 @@ public String toString() {
   }
 
   static final class Builder {
-    private static final String DEFAULT_BASE_URI = "http://localhost:9000";
-    private static final String DEFAULT_GRPC_BASE_URI = "http://localhost:9005";
+    private static final String DEFAULT_BASE_URI = "http://127.0.0.1:9000";
+    private static final String DEFAULT_GRPC_BASE_URI = "http://127.0.0.1:9005";
     private static final String DEFAULT_IMAGE_NAME;
     private static final String DEFAULT_IMAGE_TAG;